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Chest CT

A chest CT (computed tomography) scan is an imaging method that uses x-rays to create cross-sectional pictures of the chest and upper abdomen.

How the Test is Performed

The test is done in the following way:

You'll likely be asked to change into a hospital gown.

You lie on a narrow table that slides into the center of the scanner. Once you are inside the scanner, the machine's x-ray beam rotates around you.

You must be still during the exam, because movement causes blurred images. You may be told to hold your breath for short period of time.

The complete scan takes 30 seconds to a few minutes.

Certain CT scans require a special dye, called contrast, to be delivered into the body before the test starts. Contrast highlights specific areas inside the body and creates a clearer image. If your doctor requests a CT scan with intravenous contrast, you will be given it through a vein (IV) in your arm or hand. A blood test to measure your kidney function may be done before the test. This test is to make sure your kidneys are healthy enough to filter the contrast.

CT scans

A computed tomography (CT) scan is an imaging method that uses x-rays to create pictures of cross-sections of the body. Related tests include:Abdomin...

How to Prepare for the Test

Some people have allergies to IV contrast and may need to take medicine before their test to safely receive this substance.

Contrast can be given in several ways, depending on the type of CT being performed.

It may be delivered through a vein (IV) in your hand or forearm.

It may be given through the rectum using an enema.

You might drink the contrast before your scan. When you actually drink the contrast depends on the type of exam being done. The contrast liquid may taste chalky, although some are flavored to make them taste a little better. The contrast eventually passes out of your body through your stool.

If contrast is used, you may also be asked not to eat or drink anything for 4 to 6 hours before the test.

If you weigh more than 300 pounds (135 kilograms), have your health care provider contact the scanner operator before the exam. CT scanners have a weight limit. Too much weight can damage the scanner's working parts.

Because it is hard for x-rays to pass through metal, you will be asked to remove jewelry.

How the Test will Feel

Some people may have discomfort from lying on the hard table.

Contrast given through an IV may cause a slight burning sensation, a metallic taste in the mouth, and a warm flushing of the body. These sensations are normal and usually go away within a few seconds.

There is no recovery time, unless you were given medicine to relax. After a CT scan, you can go back to your normal diet, activity, and medicines.

Why the Test is Performed

CT quickly creates detailed pictures of the body. The test may be used to get a better view of the structures inside the chest. A CT scan is one of the best ways of looking at soft tissues such as the heart and lungs.

A chest CT may be done:

After a chest injury

When a tumor or mass (clump of cells) is suspected, including a solitary pulmonary nodule seen on a chest x-ray

Tumor

A tumor is an abnormal growth of body tissue. Tumors can be cancerous (malignant) or noncancerous (benign).

Risks

CT scans and other x-rays are strictly monitored and controlled to make sure they use the least amount of radiation. CT scans use low levels of ionizing radiation, which has the potential to cause cancer and other defects. However, the risk from any one scan is small. The risk increases as many more studies are done.

In some cases, a CT scan may still be done if the benefits greatly outweigh the risks. For example, it can be more risky to not have the exam if your doctor thinks you might have cancer.

The most common type of contrast given into a vein contains iodine. If a person with an iodine allergy is given this type of contrast, nausea, sneezing, vomiting, itching, or hives may occur. In rare cases, the dye can cause a life-threatening allergic response called anaphylaxis. If you have any trouble breathing during the test, you should notify the scanner operator immediately. Scanners come with an intercom and speakers, so the operator can hear you at all times.

In people with kidney problems, the dye may have harmful effects on the kidneys. In these situations, special steps may be taken to make the contrast dye safer to use.

CT scan - illustration

CT stands for computerized tomography. In this procedure, a thin X-ray beam is rotated around the area of the body to be visualized. Using very complicated mathematical processes called algorithms, the computer is able to generate a 3-D image of a section through the body. CT scans are very detailed and provide excellent information for the physician.

CT scan

illustration

Thyroid cancer - CT scan - illustration

This CT scan of the upper chest (thorax) shows a malignant thyroid tumor (cancer). The dark area around the trachea (marked by the white U-shaped tip of the respiratory tube) is an area where normal tissue has been eroded and died (necrosis) as a result of tumor growth.

Thyroid cancer - CT scan

illustration

Pulmonary nodule, solitary - CT scan - illustration

This CT scan shows a single lesion (pulmonary nodule) in the right lung. This nodule is seen as the light circle in the upper portion of the dark area on the left side of the picture. A normal lung would look completely black in a CT scan.

Pulmonary nodule, solitary - CT scan

illustration

Lung mass, right upper lobe - CT scan - illustration

This is a CT scan of the upper lungs. This individual has a mass in upper part of the right lung (left side of picture).

Lung mass, right upper lobe - CT scan

illustration

Bronchial cancer - CT scan - illustration

This chest CT scan shows a cross-section of a person with bronchial cancer. The two dark areas are the lungs. The light areas within the lungs represent the cancer.

Bronchial cancer - CT scan

illustration

Lung mass, right lung - CT scan - illustration

This is a CT scan of the upper chest showing a mass in the right lung (seen on the left side of the picture).

Lung mass, right lung - CT scan

illustration

Lung nodule, right lower lung - CT scan - illustration

A CT scan showing a mass in right lower chest near the heart (left side of photograph).

Lung nodule, right lower lung - CT scan

illustration

Lung with squamous cell cancer - CT scan - illustration

This CT scan shows a cross section of the lungs of a person with lung cancer. The two dark areas in the middle of the screen are the lungs. The light areas in the right lung represent the cancer (left side of picture).

Lung with squamous cell cancer - CT scan

illustration

Vertebra, thoracic (mid back) - illustration

These are twelve vertebra of the mid back. The last vertebra (on the left side of the picture) attaches to the lumbar (lower) spine, and the top vertebra (on the right) attaches to the cervical (neck) section of the back. The vertebra are broader and stronger than the cervical bones. This allows them to absorb the added pressure applied to the mid back, but they remain a common sight of injury. The vertebra are numbered from one to twelve and labeled T1, T2, T3, et cetera, from the upper most bones to the lowest.

Vertebra, thoracic (mid back)

illustration

Normal lung anatomy - illustration

The lungs are a major part of respiratory system. The function of the respiratory system is to supply the body with oxygen and get rid of carbon dioxide.

Normal lung anatomy

illustration

Thoracic organs - illustration

The thorax is also called the chest and contains the main organs of respiration and circulation. The heart through its main artery, the aorta, pumps oxygenated blood to all parts of the body. The lungs provide oxygen to the cells of the body and eliminate carbon dioxide. Together these organs sustain some of the most critical life functions of the body.

Thoracic organs

illustration

CT scan - illustration

CT stands for computerized tomography. In this procedure, a thin X-ray beam is rotated around the area of the body to be visualized. Using very complicated mathematical processes called algorithms, the computer is able to generate a 3-D image of a section through the body. CT scans are very detailed and provide excellent information for the physician.

CT scan

illustration

Thyroid cancer - CT scan - illustration

This CT scan of the upper chest (thorax) shows a malignant thyroid tumor (cancer). The dark area around the trachea (marked by the white U-shaped tip of the respiratory tube) is an area where normal tissue has been eroded and died (necrosis) as a result of tumor growth.

Thyroid cancer - CT scan

illustration

Pulmonary nodule, solitary - CT scan - illustration

This CT scan shows a single lesion (pulmonary nodule) in the right lung. This nodule is seen as the light circle in the upper portion of the dark area on the left side of the picture. A normal lung would look completely black in a CT scan.

Pulmonary nodule, solitary - CT scan

illustration

Lung mass, right upper lobe - CT scan - illustration

This is a CT scan of the upper lungs. This individual has a mass in upper part of the right lung (left side of picture).

Lung mass, right upper lobe - CT scan

illustration

Bronchial cancer - CT scan - illustration

This chest CT scan shows a cross-section of a person with bronchial cancer. The two dark areas are the lungs. The light areas within the lungs represent the cancer.

Bronchial cancer - CT scan

illustration

Lung mass, right lung - CT scan - illustration

This is a CT scan of the upper chest showing a mass in the right lung (seen on the left side of the picture).

Lung mass, right lung - CT scan

illustration

Lung nodule, right lower lung - CT scan - illustration

A CT scan showing a mass in right lower chest near the heart (left side of photograph).

Lung nodule, right lower lung - CT scan

illustration

Lung with squamous cell cancer - CT scan - illustration

This CT scan shows a cross section of the lungs of a person with lung cancer. The two dark areas in the middle of the screen are the lungs. The light areas in the right lung represent the cancer (left side of picture).

Lung with squamous cell cancer - CT scan

illustration

Vertebra, thoracic (mid back) - illustration

These are twelve vertebra of the mid back. The last vertebra (on the left side of the picture) attaches to the lumbar (lower) spine, and the top vertebra (on the right) attaches to the cervical (neck) section of the back. The vertebra are broader and stronger than the cervical bones. This allows them to absorb the added pressure applied to the mid back, but they remain a common sight of injury. The vertebra are numbered from one to twelve and labeled T1, T2, T3, et cetera, from the upper most bones to the lowest.

Vertebra, thoracic (mid back)

illustration

Normal lung anatomy - illustration

The lungs are a major part of respiratory system. The function of the respiratory system is to supply the body with oxygen and get rid of carbon dioxide.

Normal lung anatomy

illustration

Thoracic organs - illustration

The thorax is also called the chest and contains the main organs of respiration and circulation. The heart through its main artery, the aorta, pumps oxygenated blood to all parts of the body. The lungs provide oxygen to the cells of the body and eliminate carbon dioxide. Together these organs sustain some of the most critical life functions of the body.